Two scuba divers tried to take a selfie to impress their friends — but one of them never surfaced. Learn from the mistakes that led to their accident.

To help make wreck diving safer and more fun, Otto Wagner and Raymond Poudrier began developing detailed underwater maps of wrecks and dive sites.

This is what it's like to scuba dive at an active volcano — at Barren Island near India's Andaman and Nicobar islands.

Using a map from ArtToMedia, we bring you the best dive profiles for penetrating the Mighty Oriskany shipwreck and tips for exploring the ship safely.

One minute the water is crystal clear, but with the kick of a fin everything is covered by silt. Do you know how to survive in a low-visibility situation?

In this installment, Eric Douglas explains the relationship between heart disease risks and waistline, and explains what it's like to be in cardiac rehab.

Do you get cramps or feel fatigue after scuba diving? It's probably not decompression sickness, so try these electrolyte solutions for a more comfortable post-dive experience.

The former executive officer goes scuba diving in Grand Cayman's Kittiwake shipwreck, exploring the ship that he served on for years.

Can you dive again after open-heart surgery? Author Eric Douglas tells the true story of his heart disease recovery in his latest installment: Lessons Learned.